Hydraulic support tail beam

Abstract

The invention relates to a tail beam for a hydraulic bracket of a coal mine underground working face top slab shoring, which comprises a tail beam (3) with one end hinged on the tail of a bracket top beam (1) only by a hinged point (2) and the other end contacted with a soleplate by two lug bosses (13, 14), a top-coal caving strobe (6) which can slide along the tail beam (3), an oil cylinder (5) for driving the on-off of the strobe (6) and a direction-regulating oil cylinder (9). As the tail beam is only supported by three points of the hinged point (2), the lug boss (13) and the lug boss (14), the tail beam is stably supported and free from torsion, the weight is reduced. A recess between the lug bosses (13, 14) is convenient to discharge gangue and in particular suitable for being used in uneven soleplates and working faces with more dunn bass in coal wall.

Description

technical field [0001] The invention relates to a sliding roof beam hydraulic support used for a coal mining working face in a coal mine and a tail beam used for the fully mechanized mining hydraulic support. Background technique [0002] Hydraulic supports are divided into two categories: fully mechanized mining supports and sliding roof beam hydraulic supports. The background technology of the utility model is the technology and fully mechanized mining support described in "General Technical Conditions for Sliding Roof Girder Hydraulic Supports" in China's coal industry. The existing technologies in the field of sliding roof beam hydraulic support include suspension roof beam hydraulic support (Chinese Patent Application No. 88104291.9); parallel sliding roof beam hydraulic support (Chinese Patent Application No. 91200747.8). The tail beams of the above-mentioned supports are mostly made of section steel, including straight tail beams, curved tail beams, broken-line tail ...

AI Technical Summary

Problems solved by technology

The tail beams of these brackets are relatively narrow, and the gap between the tail beams is large, and gangue and coal are easy to leak through the gap, so the roof net must be laid when the top coal is laid, so the cost per ton of coal is increased.

In addition, because the structure of these tail booms is a two-point support, and except for the straight tail boom, they are all bent upwards, so the center of gravity of the tail boom is higher than the line connecting the two support points, so it is unstable and has a block When large gangue and coal fall between the two tail beams, the tail beam will be tilted outwards, causing the tail beam to overturn, causing danger

In the fully mechanized mining support, the tail beam is called the cover beam, which is connected with the top beam as a whole. It has high strength, but is relatively heavy. Each support weighs about ten tons, which is not suitable for light supports.

There is also a support with an integral wide tail beam, which solves the problem that the narrow tail beam made of section steel must be laid when the top coal is laid. difficulty

In addition, the lower end of this tail beam is in contact with the bottom plate by a line. Although it is not easy to fall over, there are two hinge points on the tail beam that are far apart, which are respectively hinged on both sides of the entire top beam or the entire frame bracket. The contact line at the lower end of the beam and the two hinge points on the upper side are often not in the same plane, so it will be distorted and deformed when subjected to the pressure of gangue, and sometimes the top beam and tail beam will be damaged.

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